powerpc/powernv: document cxl dependency on special case in pnv_eeh_reset()

[Michael Ellerman]

On Fri, 2016-07-22 at 07:16:35 UTC, Andrew Donnellan wrote:
> pnv_eeh_reset() has special handling for PEs whose primary bus is the root
> bus or the bus immediately underneath the root port.
> 
> The cxl bi-modal card support added in b0b5e5918ad1 ("cxl: Add
> cxl_check_and_switch_mode() API to switch bi-modal cards") relies on this
> behaviour when hot-resetting the CAPI adapter following a mode switch.
> Document this in pnv_eeh_reset() so we don't accidentally break it.
> 
> Suggested-by: Gavin Shan <gwshan at linux.vnet.ibm.com>
> Signed-off-by: Andrew Donnellan <andrew.donnellan at au1.ibm.com>
> Reviewed-by: Gavin Shan <gwshan at linux.vnet.ibm.com>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/b7da1230532984fc00962b2c8be94a

cheers